On undefined, CNPJ dosen`t update SCOPE

On pre-populated inputs, if scope has cnpj model equals a undefined, the scope is not being updated.

ref.: ui-br-cnpj-mask

// scope with data from MYSQL

```
console.log($scope.loja)
```

```
Object {
CNPJ: undefined
IDCidade: "193"
IDCliente: 2
IDLoja: 1
NomeLoja: "BROOKLIN"
StatusLoja: "ativa"
}
```

// html

```

```
##

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